Railway signaling system



J. B. HARLOW.

' RAmWAY SIGNAUNG SYSTEM.

APPLICATION FILED`APR. 9. i915.

1,373,503. Patented Apr. 5, 19.21.v

by MM M w'wm A@ SGEN BRELYTON HARLOW, UF NEW Y0ltK,' N. Y., ASSGENR, BY MESNE ASSIGNMENTS, '110 'WESTERN EIfEC'lltlICl COMPANY, INCRPRATED, A. GGRPRATXON @E NEW p YORK.

RALWAY SIGNALNG T0 altwhom it may concern:

Be it known that l, JOHN B'nAirroN llan-y Low, a citizen of the United States, residing at New York, in the county. ot N ew YorkA vand State of New York, have jin'vented certain new and useful lmprovements in Rail way Signaling" Systemacf which the following isa full, clear, concise, and exact de- I quick-acting magnet 25, and a `slowacting scription. l

rlhis invention relates to railway signaling systems.

rh@ Object of aus inventan is a provid@ such a system by'means of which a desvv patcher or attendant at a central station may determine when a train or. car enters any particular section, of track.

ln accordance with this invention there isprovided a signalingcircuit extending from a central station along a railroad track divided into sections. With atleast some of the sections of track, are lassociated signal sending devices set and conditioned for operation .trom the central station, the passing of atrain or carinto the sections causing the signaling sending devices to send signals to the central station.

l',lhe `drawing is a diagram of the apparatus and connections of a railway signaling system embodying this invention.

ln the drawing, A designates a central or y receiving station, B and C designate sections of a railroad track along which extend line wires 5 and 6 connected to the receiving or central station A.

Located atthe central station is anim` pulse transmitting device'7 and a -contact lmaking device 8 in a' local circuit includingV a source of energy lOand the windings 1-1 of an impulse relay.' rlhe impulse vrelay includes normally open contacts 12 and 13 and a normally closed contact 14. The closure of the contacts 12 and 13connects a source of current 15 with the line wires 5 and 6. The contact 14, in the operation of the impulse relay, opens and closes a bridge of the line' including a non-inductive resistance 16, said bridge being open when the contacts 12 and 13 are closed, and closed when the contacts 12 and 13 are open, the purpose being to provide a low resistance discharge path for retardation coils 17, 17 and 18, 18, in series withthe line wires and a condenser 19 in bridge of the line wires. I The retardation coils and thondenser are `for the purpose Specification of Letters Patent.

Patented 5, 1921.

Application filed .april 9, 1915. Serial No. 20,221.`

, of graduating the currentiinpulses from the impulse relay in order that they will not 'cause the disagreeable thump in telephonie apparatus which may be connected with the linevvires during the transmission ot"- the impulses.

selective circuit closing device comprising a magnet 26 for operating the stepping and holding pawls 27 and 28 which control the movement oit a ratchet wheel 29.

wheel, to engage a contact spring 31. The selector is preferably arranged to be held in its circuit closing position only when current is traversing. the windings of its magnets.' The selector may be connected in a local circuit Icontrolled by a relay 35 in bridge of the 'line wires. lmpulse transmitting key 7 at station A. is for operating the selector at track section Located at track section B is a step-bystep A Carried y -*by the ratchet wheel 29 is a contact arm 30, adapted in the movement of said ratchet A relay 39 and electromagnet 41 are under control ofv the selector and are actuated when contacts 30 and31 are in engagement. The electromagnet 41, upon energization, attracts an armature 42 which through a connecting arm 43 closes contacts 44, 45, 46, 47 and 48. Closure ot contacts 44 and 45 establishes a lockingcircuit for electromagnet 41 through vwinding thereof.` 'l`he armature 42 carries a pawl 49 which engages a ratchet wheel 50 mounted on one end of a shaft 51, upon the other end of which is mounted a contact controlling wheel 52 having a notched periphery. Engaging the notchedperiphery i of wheel 52 is a spring contact member 53,

and as shaft 51 is rotated under control of the pawl 49 and the ratchet wheel 50, a contact 5 4, controlled by the wheel 52 and the member 53 is alternately closed and opened. A track relay is bridged across the two rails ot the track section B and is normally energized by current 'from a battery 61 located at one end of the section when there is no train or car in the section. Armature 62 of track relay 6()Y is therefore normally in attracted position. A motor 65 is under the control of electromagnet 41 and the circuit thereof is closed when contact 48 is made. 'llhe motor 65 is adapted to drive a shaft 66 which lcarries code Contact wheels 67 and 68. Contacts controlled by these Wheels open and HMI mls may.

mln 0 "me "uhits 10h im me@ n uw mam @1 '130 GLOSS Mal?, @Uf

v van 1 u terence track relay 60, andcontact 54C to ground. rlhe release of track yrelay 60, also causes the release of relayf. The operation of electromagnet il closes its locking circuit andthe operating circuit of the motor-65 hereinbefore traced, whereupon the motor ,65 rotates. The rotation of motor 65 causes code contact Wheel 68 tosend a distinctive signal to the receiving station A indicating thata train has entered track sectionfB. 'This sig nal is produced by thelalternate closing and opening at contact 81 of the circuit which inay be traced from the lower brush of motor 65, through armature 63 and contact 59 of relay 64, contact 8l of code contact wheel 68, contact46, condenser 82, line, wire 5, receiver 83 at station A, line wire 6, condenser 8e, contact et?, and the upper brush andarina'- ture operator 65. The opening and closing of this circuit causes a tone to be `produced in receiver 83. Y

rlhe passing of a train or car out of. track section B again energizes track magnet 60, but the signal sending device at trackv section B will continue to send out a signal until, the electromagnet 41 is released bythe op# eration of the key 8 at the station'i, after which all apparatus returnsvtol normal' condition as indicated in the drawing.

While aplurality lor batteries have; been shown at the track section itis to be underi stood .that this is for convenience only and that in practice one battery is vsubstituted.

therefor.- However,'track battery 6l is separate and;dist inct-;troni' the battery which is associated with the other apparatus.

What is claimed i's: 1

l. ln a railway signaling system, a receiving station, a railroad track divided into sec-l tions, a line circuitextending from said receiving station along said railroad track, a

signal sending device ateach of a plurality ot said sections, an operatiiigvcircuit there` for, an'electroinagnet controlling said operating circuit and the'connection of saidl signal sending device with said line circuit, a selectively operated device controlled over said linecircuit from said receiving station, a track. controlled device, and an energizing circuit for said electromagnet jointly' controlled by said selectively operated device and said track controlled device.

2. ln a railway ysignaling system, a receiving station, a `sectionof railroad track', a line circuit extending Vfrom said receiving station to said section, a signal sending device at said section, an operating circuit therefor, an electromagnet controlling said operating circuit and 'the connection of said signal sending device with said line circuit, an energizing circuit for said electromagnet open at two points, ineans at said section controlled over said line circuit from said receiving station for controlling the closing of said energizing circuitatone point, and -a trackcontrolled device for completingA said energizing circuit at the other point when a train enters the section'.

3. in a railway signaling system, a receiving station, arailroad track divided into sections, a line circuit. extending from said v receivingV station.` along said railroad track, a signal sending device at each of a pluralityof said sections, an operating circuit therefor, an electromagnet controlling said operatingcircuit and the connection of said signal sending device with said line circuit,

an energizing circuit for said electromagnet open at two points, aselectively operated device controlled from said receiving sta- 'tion .for controlling the closing of said energizing circuit 'at one point, and a track relay controlled by a tra-in 'entering theY section for closing said energizing circuit at the other pi'iinte e. ln' a". railway signaling sys-teni, a receiving station, a railroad track divided into sections, a line circuit extending from said receiving station along said railroad track, a signal sending device at each of a plural.-

-ity of said sections, an operating circuit therefor, an electromagnet controlling said :operating circuit and the connection of said signal sending device with said lline circuit, an' energizing circuit for said electromagnet having two branches,`the rst open at one point and the second open at two points, a 'selectively operated device controlled from saidreceiving station for completing said -'rst branch, the operation fof 'said' electro-- of said sections, an operating circuit therefor, anelectromagnet controlling said operating circuit and the connection of said signal .senlding device with said line wires, an.

energizingl circuit ,for said eleetromagnet having two branches, the Erst open at one point and the second open at two oints, a

- selectively operated device control ed from said receiving station ,for completingsaid iirst branch and for controlling `thel closing of said .second branch at one point, an

nieans controlled by a train entering the receiving station along said railroad track,

asignal sending device at each of a plurality of said sections, an operating'circuit therefor, aiielectromagnet controlling said operltd sections, a line circuit extending from saidiic l lie .ist

ating circuiti, mici when. cpciaicc@Q ccniiecb .ing Hic sigiizii sending dcvicc in@ iic circuit, a, selectively ojgci'nfceci (ici/'icc contiolicci @ver smid line ciicui 'i'om amici rccciviigg' Station a Esiick ciay; and Mi cnc gizinf; cii'cui foi' said eiectromaguci: jointiy controlled byssaifi sciectivciy operated. dc-

mce when selected and said ftmck mia-jf when mi biai'n ciigcfs die sccion.

3,0 7. 'ii n, railway signaling system, a rc ceiviiig station, :i i'ailrozi'ci track divided into Sccions, a 1in@ circuit extending fiom 'the receiving station along the track, fi signail sciidiiig device ai'. cach of a puigdity of said secioiis, am ciectiomagut when 0per- E. hmm? fl. in. STAHL. 

